31140040 has 32 divisors (see below), whose sum is σ = 70330680. Its totient is φ = 12408832.

The previous prime is 31140029. The next prime is 31140047. The reversal of 31140040 is 4004113.

It can be written as a sum of positive squares in 4 ways, for example, as 30758116 + 381924 = 5546^2 + 618^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31140040.

It is not an unprimeable number, because it can be changed into a prime (31140047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10392 + ... + 13048.

Almost surely, 2^31140040 is an apocalyptic number.

It is an amenable number.

31140040 is an abundant number, since it is smaller than the sum of its proper divisors (39190640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31140040 is a wasteful number, since it uses less digits than its factorization.

31140040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2961 (or 2957 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 31140040 is about 5580.3261553425. The cubic root of 31140040 is about 314.6103858534.

Adding to 31140040 its reverse (4004113), we get a palindrome (35144153).

The spelling of 31140040 in words is "thirty-one million, one hundred forty thousand, forty".